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Heating & Air Conditioning

blower not working

8 years ago

I have a York Diamond 80 furnace model no. p4hua12no6401a that the blower will not come on in the auto mode. When in auto the gas will fire up for 30 or 40 seconds but then shut down. With heat on it will run but only with the fan in manual mode.
The only thing I have done is replace the thermostat...that did not help.
Any suggestions will be appreciated.

Featured Answer

klem1

8 years ago

Odds are 90% fan relay is bad,9% there's a bad wire connection and 1% it's something else.

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Comments (6)

PRO
Air and Energy Soutions
8 years ago
Unless it's extremely old (they've made these things for a while), the fan in heat mode will be energized through a timer on the control board. What happens if you put the fan in "on" mode? Does it continue to fire and run? If so, you may have a bad fan output on the board. Also, the "heat" fan speed is different than the fan speed you get from putting the fan in "on" mode. It's remotely possible that you could have a bad motor speed. If you would like to check it yourself, cycle the heat and keep your multimeter on VAC while you start it. The fan will not attempt to cycle on for several seconds while it heats up the heat exchanger. You should measure line voltage between the fan tap labeled "heat" and common. If not, you may have a defective board.

Some of this depends on the age of the system and what type of controls were installed. If you would like to find the age of your system, I have a blog post that will help. Here's the link at How to determine the age or your York heating and AC unit . Also, if you would like to double check your connections from your thermostat you just replaced, see How to replace your Own Thermostat. It's Easy! Hope this helps!
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bphocutt
Original Author
8 years ago
Klem1, Does the fan relay plug in or is it soldered? Also, When I turn the unit on I can place my finger on the relay and feel it click. Is this an indication that it is working?
bphocutt
Original Author
8 years ago
Air and Energy Soutions I have been
experimenting with the unit and the ac works like it is suppose to....fan and ac
comes on correctly. But it is the heat that does not work properly. Seems that
you can put the fan on manual and then switch to heat it will work on that cycle
but not sure on next cycle. Placing the unit on auto and the heat fires up but no fan.

Please bare with me as I am not a tech as you have guessed.

You said: "You should measure line voltage between the fan tap labeled "heat" and common. If not, you may have a defective board".

I will try this. Is the fan tab on the main board or anywhere the fan gets it ac power?
bphocutt
Original Author
8 years ago
Air and Energy Soutions: one other thing I check is the limit switch. I removed it and with a hair dryer heated the unit up and it will cycle on, cool down and cycle off. So I am assuming it is ok.
klem1
8 years ago
There should be a schematic glued to unit,likly on access door. That will show you where everything is simply following wire colors. "NO" clicking definatly does not confirm operation,contacts are usually burnt preventing electrical contact. If you didn't have an ohm meter between poles while testing limit switch,go back and retest. Re; Fan works at automatic during cool mode, on and cool are usually same speed. Heat is usually low speed and medium speed might be taped up and not in use. If low speed is burned out as air and energy suggested ( something I highly doupt ) ,just move unused lead over until motor can be replaced.

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